OS Command Injection Vulnerability in Perle IOLAN STS/SCS Terminal Servers
CVE-2026-23759

8.6HIGH

Key Information:

Vendor: Perle Systems
Status: Iolan Sts; Iolan Scs
Vendor: CVE Published:; 17 March 2026

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What is CVE-2026-23759?

The Perle IOLAN STS/SCS terminal servers running firmware versions prior to 6.0 are susceptible to an OS command injection vulnerability. This security flaw allows authenticated users to exploit the restricted shell accessed via Telnet or SSH. Due to improper argument sanitization in the shell 'ps' command, an attacker can inject shell metacharacters following the 'ps' subcommand. By executing these commands, the attacker may gain root privileges, potentially compromising the entire operating system running on the device.

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